Geometric factors such as the tapering of wire profiles and size variations are critical to the stability and dynamics of spin textures, as it affects the homogeneity of magnetic parameters,[1]}, [2]}, [3]}, [4]}, [5]} introduces pinning [6]}, [3]}, [8]}, [9]} and confinement effects. [10]}, [11]} Edge taper, characterised by a trapezoidal wire cross-section, is a common feature of patterned wires due to the shadowing effect that arises from the etching process (Section3a). [12]}, [3]}, [1]} In IPA nanowires hosting transverse DWs, we reported that tapering can modify demagnetisation fields at the edge and delay the onset of Walker Breakdown, thereby increasing the maximum DW velocity by a factor of \(\approx 2\) . [1]} In PMA nanowires, the K\(_\mathrm {eff}\)  of the tapered wire can be tuned to allow spin texture nucleation at desirable switching fields (Section3a). [3]} This effect is material dependent - preferential spin texture nucleation is observed at the tapered edges of [Co/Pd]\(_{15}\)  (Section3aiii, v) due to their degraded interfacial-induced PMA, while initial nucleation is favored at the center of the L\(1_\mathrm {0}\) -FePt wire (Section3aiv, vi) due to higher PMA at the thinner edge. Additionally, we observed that edge-induced pinning effects impeding DW translation became significantly detrimental for narrower wires (width: \(\le \)  50 nm). [6]}
